Not all of these games are gonna perfectly on any hardware configuration. Most of these games are meant to be played on Newer Low-End Hardware or Old Hardware that are pretty High-End at the time that they were released.

List of Games with MINIMUM System Requirements(CPU, RAM, API, GPU, DRIVE SPACE)
1. Doom 1
486 Processor at 66MHZ (Pentium/Athlon)
8MB
?
?
40MB
2. Far Cry 2
Pentium 4 3.2GHZ/Athlon 64 3500+
1GB
DirectX 9
GeForce 6800+/Radeon X1650+
12GB
3. Half Life 2
1.2GHZ CPU
256MB
DirectX 7
DX7 GPU
4.5GB
4. Battlefield Bad Company 2
Dual Core 2.0ghz
2GB
DirectX 9
GeForce 7600GT/Radeon X1800
6GB
5. Call Of Duty 4 Modern Warfare
Pentium 4 2.4GHZ/ Athlon 64 2800+
512MB
DirectX 9
GeForce 6600+/Radeon 9800 Pro+
8GB
6. Fallout New Vegas
Dual Core 2GHZ
2GB
DirectX 9
GeForce 6/Radeon 1300XT Series
10GB
7. Quake 3
Pentium 2 300MHZ or Athlon K6 350MHZ
64MB
?
16MB Graphics Card
840MB
8. Deus Ex: Human Revolution
2.0GHZ Dual Core
1GB
DirectX 9
GeForce 8000/Radeon HD2000 Series
8.5GB
9. Left 4 Dead
Pentium 4 3.0 GHZ
1GB
DirectX 9
GeForce 6600/Radeon 9600
7.5GB
10. Counter Strike Source
Pentium/Athlon 1.7GHZ
512MB
DirectX 7
DirectX 7 Level Videocard
4.6GB

Music:
JPB – High